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error[E0106]: missing lifetime specifier
  --> $DIR/foreign-fn-return-lifetime.rs:5:19
   |
LL |     pub fn f() -> &u8;
   |                   ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime
   |
LL |     pub fn f() -> &'static u8;
   |                    +++++++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0106`.